diff --git a/banking_breakdown/ui.py b/banking_breakdown/ui.py
index 164b785..e046d11 100644
--- a/banking_breakdown/ui.py
+++ b/banking_breakdown/ui.py
@@ -8,7 +8,7 @@ from PyQt6.QtCore import Qt, QSortFilterProxyModel
 from PyQt6.QtGui import QPixmap, QAction
 from PyQt6.QtWidgets import QMainWindow, QPushButton, QHBoxLayout, QLabel, \
     QVBoxLayout, QMenu, QApplication, QTableView, QListView, QInputDialog, \
-    QMessageBox, QFileDialog
+    QMessageBox, QFileDialog, QListWidget
 
 
 #
@@ -91,7 +91,7 @@ class MainWindow(QMainWindow):
         self._apply_button \
             = self.findChild(QPushButton, "applyCategoryButton")
         self._list_widget \
-            = self.findChild(QListView, "categoryListWidget")
+            = self.findChild(QListWidget, "categoryListWidget")
         self._table_view \
             = self.findChild(QTableView, "transactionTableView")
         self._action_save \
@@ -257,16 +257,40 @@ class MainWindow(QMainWindow):
         self.set_statement_data(df)
 
     def _handle_create_click(self):
-        self.add_categories(['asdf'])
+        new_name, flag = QInputDialog.getText(self, "Create category",
+                                              "New category:",
+                                              text="Category")
+        if not flag:
+            return
+
+        current_items = [self._list_widget.item(x).text() for x
+                         in range(self._list_widget.count())]
+
+        if new_name not in current_items:
+            self.add_categories([new_name])
+        else:
+            QMessageBox.warning(self, "No action performed",
+                                f"Category '{new_name}' already exists.")
 
     def _handle_delete_click(self):
-        print(self._list_widget.selectedItems()[0].text())
+        selected_item = self._list_widget.selectedItems()[0]
+
+        button = QMessageBox.question(self, "Delete category",
+                                      f"Are you sure you want to delete"
+                                      f" category '{selected_item.text()}'?")
+
+        if button == QMessageBox.StandardButton.Yes:
+            self._list_widget.takeItem(self._list_widget.row(selected_item))
+
+    def _assign_category(self, category: str):
+        print(category)
 
     def _handle_apply_click(self):
-        print(self._list_widget.selectedItems()[0].text())
+        category = self._list_widget.selectedItems()[0].text()
+        self._assign_category(category)
 
     def _handle_item_double_click(self, item):
-        print(item.text())
+        self._assign_category(item.text())
 
     def _handle_save(self):
         filename, _ = QFileDialog.getSaveFileName(self, 'Save File')